Factorise by using formula: $1 - 25 (a + b)^{2}$

(1 + 5 a + 5 b) (1 - a - 5 b)

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(1 + 5 a + 5 b) (1 - 5 a - 5 b)

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(1 + 5 a + 5 b) (1 - 5 a - b)

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(1 + a + 5 b) (1 - 5 a - 5 b)

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Solution

The correct option is B $(1 + 5 a + 5 b) (1 - 5 a - 5 b)$
$F a c t o r i z i n g {(1)}^{2} - {5 (a + b)}^{2}, = (1 + 5 a + 5 b) (1 - 5 a - 5 b)$ \\
using the identity $(a^{2} - b^{2}) = (a + b) (a - b)$

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Factorize the expression: $1 - 25 (a + b)^{2}$

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